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Re: [ESPResSo-users] Lattice Boltzmann Boundaries

From: Kai Szuttor
Subject: Re: [ESPResSo-users] Lattice Boltzmann Boundaries
Date: Thu, 4 Jul 2019 16:48:05 +0200


you can try to use LB boundaries with velocity boundary conditions but I have 
not tested this myself.



> Am 04.07.2019 um 16:02 schrieb Martin Kaiser <address@hidden>:
> Hi everybody,
> I have a question regarding the box boundaries in a Lattice Boltzmann 
> Simulation. The situation is as follows:
> I took the code from the LBM  Tutorial Part 1, where there is a square tube 
> with a sphere in the centre. The flow is created just as in the sample code. 
> My problem is that, for what I need to do, I need to change the parameters so 
> that I see vortices behind the sphere (increasing Reynolds number). Due to 
> the periodic boundary conditions on the open ends of the tube, the “tail” 
> that is created behind the sphere re-enters the simulation box from the other 
> side and thus perturbing my system in an unwanted way.
> Is there a smart way in ESPRESSO to bypass this, creating an ,sort of, inlet 
> and outflow boundary conditions on the open ends of the tube?
> I hope that my issue is clear, all the best,
> Martin

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